I currently have a Tanglefree Dead Zone. It is pretty low profile and super roomy inside. Very comfy with plenty of room for blind bag, coffee, etc. It doesn't fold up the best though. Essentially the frame collapses and the part from the doors to you feet folds over (that part does not have a fame, it is just bag). I would guess it is 48" or so long and 36" wide when collapsed.
I still buy used original Final Approach blinds when I can find them- they are without a doubt the best ever made, but they too suffer from the dimensions when collapsed- excluding the original x-landers. Those were nice, but I never liked the doors just laying on your chest part.